Question

Calculate the area of cross section of a wire of length 2m, its resistance is 25Ω and the resistivity of material of wire is 1.84*10-6 Ωm.

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Answer 1

$\huge\boxed{\sf{\red{Required~Answer:}}}$

${:⇒}$$\tt{resistance = \frac{(resistivity×length)}{area}}$

${:⇒}$$\tt\blue{25 = \frac{(1.84×10^{-6}×2)}{area}}$

${:⇒}$$\tt\pink{area =\frac{ (3.68×10^{-6})}{25}}$

${:⇒}$$\tt\purple{area = \frac{(0.736×10^-6)}{5}}$

${:⇒}$$\tt\orange{area = 0.1472×10^{-6}}$

${:⇒}$$\tt\green{area = 1.472×10^{-7}~m{^2}}$